8. Pravcicka Brana – Czech Republic
The largest natural sandstone arch in the world, tourists used to be allowed on the arch but have since been banned in an effort to reduce erosion.
The arch will eventually collapse, but the Czech government are doing their best to preserve it for as long as possible.
Measuring over 26m wide and 16m high, the arch looks bigger than expected, especially when you’re close to it.
You’re still allowed in the area around the arch, so you can still admire this beautiful piece of nature.